I personally don't like to mix. If a perfume is good, I like to enjoy it as is, and if it's not good, it's hard to make it better by mixing. Perfumes are themselves mixes of many notes, so it's not that one can fine tune one note or another.
That said, there's nothing wrong in layering, so if you like it, why not? Edts and edps are usually constructed to give out a big blast in the top notes, so it will be hard to match tops - it will be cacophonous. But the top is transient and what you're left with is the base. Here perhaps there are more possibilities for mixing.
You can play around on paper, just spray two things on the same paperstrip and follow the evolution (remembering that on paper it takes much longer to get to the drydown).